Hi all! I have a 55gal community tank with multiple fish, all non aggresive fish. My ammonia reads 0, nitrite 0, nitrate 10, p.h 7, temp is 26 c. Lastnight while watching my fish. i noticed my black female had a larger belly than normal and was gasping erratically. now ive ruled out it being dropsy and seeming as she is with a male sailfin the probability of her being pregnant is very high. though the gasping is a worry. she is always gasping at the top. non of the other fish do this whatsoever. Help please?